picto fleche Vapormatic starters for low and medium power slipring motors up to 750 kW

RLV vapormatic starters are used when the driven machines are of great inertia or when the rating power of starting / driven machine is low.

  • Reliable: no moving parts, unaffected by demanding atmospheres
  • Economical: cable saving, reduced maintenance, competitive price
  • Customizable to specific motor requirements
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RLV vapormatic starters are used when the driven machines are of great inertia or when the rating power of starting / driven machine is low. They have the following advantages:


  • No moving parts other than the short circuit contactor
  • Unaffected by damp, dusty or corrosive atmospheres


  • Cable saving: integral contactors
  • Facilitate installation beside motors
  • Electrical and mechanical maintenance considerably reduced
  • Competitive price


  • Easy adjustment gives "made to measure" starting conditions and conversion to suit different drives.

Operating principle

The starting principle is based on the difference in resistivity between a liquid electrolyte and its vapour, contained in an electrode chamber. The passage of the initial rotor current causes immediate partial vaporisation of the electrolyte and instantaneously adjusts resistance and starting torque to optimum values. During the run-up to speed, the thermal interchanges which occur progressively decrease the resistance. A timed contactor then short circuits the low residual resistance. The starting torque is determined according to the requirements of the driven machine or the current limitation.

Electrical features:

ReferenceProtectionTankNumber of electrode assembliesRatingShort circuit contactor (choice)
M15IP6315 l130 kW (40 ch.) max140 A 175 A
M35/1IP6335 l130 kW (40 ch.) max
M35/2IP6335 l230 to 60 kW (40 to 80 ch.) max110 A 175 A 380 A
M35/3IP6335 l330 to 90 kW (80 to 125 ch.) max
M35/4IP6335 l490 to 120 kW (125 to 160 ch.) max
M70/4IP6370 l490 to 120 kW (125 to 160 ch.) max140 A 175 A 280 A 420 A 630 A 700 A
M70/6IP6370 l6120 to 200 kW (160 to 270 ch.) max
M350/2AIP54350 l2200 to 300 kW (270 to 400 ch.) max1300 A
M350/2BIP54350 l2300 to 440 kW (400 to 600 ch.) max
M350/3IP54350 l3440 to 750 kW (600 to 1000 ch.) max

Rotor voltage between slip rings: - M15 / M35 / M70: 750 V - M350: 1500 V

Further features

ElectrolyteComposition : In powder or crystal form for mixing with drinking water and anti-evaporation oil Electrolyte temperature is controlled by thermostat: - M15 / M35 / M70: 10 A / 220 V, 8 A / 380 V or 5 A / 500 V - M350: 9 A / 380 V Electrolyte level: - M15 / M35 / M70: By filler pipe - M350: By magnetically operated float switch (250 V – 60 VA) in each compartment
Electrode assemblyThe RLV “triphase” electrode assembly is a standard component. The value of resistance is factory preset according to the data of the driven machine given by the customer at the order. It is always possible for him to make adjustments on site, either for a change of drive of for a different duty. This is easily carried out by changing the electrolyte and/or the size of the electrode chamber.
Rotor starter protection systemOn request we can supply your starter with an electronic module type DRS. This module allows the following: - locked rotor detection of your motor - optimisation of the starting time by measuring the true speed of the motor - temperature monitoring of the electrolyte - limitation of the number of starts per hour Any anomaly in the starting sequence is detected by a fault relay which can be connected to your control panel.

General specifications

ReferenceAverage weight with contactor
Without electrolyteWith electrolyte
M1525 kg25 kg
M35/138 kg73 kg
M35/238 kg73 kg
M35/338 kg73 kg
M35/438 kg73 kg
M70/4115 kg185 kg
M70/6115 kg185 kg
M350/2A170 kg530 kg
M350/2B170 kg530 kg
M350/3170 kg530 kg

In order for us to quote a starter adapted to your application, please let us know the following information:

About the starter:

  • Power
  • Speed (rpm)
  • Required starting torque
  • Motor voltage
  • Stator current

About the driven machine:

  • Type
  • Coupling method
  • Moment of inertia
  • Speed (rpm)
  • Number of consecutive starts

Particular specifications:

  • Control panels


  • Electrolyte
  • Antifreeze
  • Anti-evaporation oil

Incorporated short ciruit contactor

B445                 445 A

B550                 550 A

B800                 800 A

B1000               1000 A*

* Box 1000 x 800 x 400 mm

Options and accessories: